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Optical magnification device for distance variation

a technology of optical magnification and distance variation, which is applied in the direction of instruments, spectacles/goggles, mountings, etc., can solve the problems of difficult exchange of lens groups, objects by means of axially displaceable lens elements or lens groups, and binocular magnifiers

Inactive Publication Date: 2007-08-07
LEICA INSTR SINGAPORE PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enables flexible focusing and focal length modification in optical instruments, resulting in shorter overall lengths, reduced weight, and expanded application ranges by using progressive lenses for focal length adjustment rather than vision correction.

Problems solved by technology

It is recognized that focusing on an object by means of axially displaceable lens elements or lens groups, as in the case of conventional microscopes, binocular magnifiers, etc., is disadvantageous in terms of the following aspects:a) Changes in overall length.b) Greater weight because of greater overall length.c) Complex design solutions in some cases, if focusing is to occur in “open space,” i.e., without a fixed housing having the corresponding mechanisms, for example in a binocular magnifier.d) Lens groups are difficult to exchange, and the range of application for binocular magnifiers or microscopes is therefore limited.

Method used

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  • Optical magnification device for distance variation
  • Optical magnification device for distance variation
  • Optical magnification device for distance variation

Examples

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Embodiment Construction

[0024]In FIG. 1, light emitted or reflected by object 7 is directed via a binocular magnifier 5, joined by immovable connection 6, to two progressive lenses 3, guided together by common guidance system 4, which are arranged in the optical axis 2 of each of the observer's eyes 1. Light incident on progressive lenses 3 is refracted thereat and deflected to observer's eyes 1.

[0025]In order to achieve a focal length modification or a variation in the distance between observer's eye 1 and object 7, progressive lenses 3 are arranged displaceably in the lateral (non-axial) direction. In the context of stereoscopic viewing, the two progressive lenses 3 are displaced in parallel fashion. For that purpose, they are immovably connected to one another by common guidance system 4, in the context of binocular magnifier 5 shown here.

[0026]The entire system is embodied, for example in the application depicted here for a binocular magnifier, as an eyeglass frame; adjustment of the progressive lenses...

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Abstract

An optical magnification device for varying the distance between an observer's eye (1) and an object (7), e.g., for a binocular magnifier or a microscope, in which focusing onto the object (7) is accomplished by means of progressive lenses (3) displaceable perpendicular to the observation beam(s) (2).

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 10 / 342,752 filed Jan. 15, 2003, now abandoned which claims priority of the German patent application 102 01 835.9, filed Jan. 18, 2002, which is incorporated by reference herein.FIELD OF THE INVENTION[0002]The invention concerns an optical magnification device, for example a binocular magnifier or a microscope, which permits a variation in the distance between an observer's eye and an object.BACKGROUND OF THE INVENTION[0003]A property often demanded for microscopes and binocular magnifiers is that the working distance of the optical device be capable of modification within a specific range, typically between 200 mm and 400 mm (also called the “focusing range”). At present, this is achieved by the fact that at least one optical element (for example, a lens element or a lens group) is shifted axially in the optical axis, bringing about a modification in focal length. This usual...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B21/22G02B25/00G02B7/06G02B15/04G02B21/24G02C7/08
CPCG02B7/06G02B15/04G02B21/241G02C7/088
Inventor SANDER, ULRICH
Owner LEICA INSTR SINGAPORE PTE